EP0835478A1 - Solid state sound lamp - Google Patents
Solid state sound lampInfo
- Publication number
- EP0835478A1 EP0835478A1 EP96909663A EP96909663A EP0835478A1 EP 0835478 A1 EP0835478 A1 EP 0835478A1 EP 96909663 A EP96909663 A EP 96909663A EP 96909663 A EP96909663 A EP 96909663A EP 0835478 A1 EP0835478 A1 EP 0835478A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led die
- intensity
- led
- sound lamp
- assembly according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
- G11B7/0032—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent for moving-picture soundtracks, i.e. cinema
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means
- G03B31/02—Associated working of cameras or projectors with sound-recording or sound-reproducing means in which sound track is on a moving-picture film
Definitions
- the invention relates to the light source used to read digital and analog information on photographic color dye film.
- incandescent sound light sources One of the problems with incandescent sound light sources is that the average life of the incandescent light source is less than 1000 hours requiring frequent replacement. Second, the excessive heat in the incandescent sound light source distorts the shape of the filament and causes intensity variations over time which result in amplitude distortion in the sound playback. Third, the vibration components of the projection machine can cause spurious microphonic problems in the sound system.
- the present invention is characterised by a sound light source that overcomes the problems caused by the prior art incandescent light sources by combining leading edge LED technology with precision optics.
- the present invention is a replacement light source for the incandescent light source which illuminates the color dye film so the analog or alternative information encoded onto the color dye layers can be read. It combines long life, minimal heat dissipation and immunity from microphonic problems.
- Typical color dye film is composed of three dye layers -- a magenta dye layer, a cyan dye layer, and a yellow dye layer. Release prints can be made utilizing any or all of these dye layers. Any new projector sound light source must produce high intensity illumination in the visible range.
- LED light sources can emit high levels of narrow spectral energy with very little infrared energy.
- an LED process is selected that has a peak energy that coincides with the maximum density of a particular dye layer, an efficient, high quality system can be realized.
- Tests have shown that the a 660 nm GaAlAs ultrabright red coincides perfectly with the cyan dye density curves. (See curves in Figure 1.)
- the cyan color dye layer has the best resolution on color dye film.
- an immersion type lens is used in front of the LED die array. The lens redirects the wide LED output pattern into a small cone of light in order to allow it to efficiently enter existing projector optics.
- the entire assembly is mounted in a standard sound lamp base to permit it to be easily installed in existing projection equipment.
- FIG. 1 is a graph illustrating the typical spectral response of the dye layers on color print film and a GaAlAs 660 red LED array;
- FIG. 2 is a block diagram of the preferred embodiment of the present invention.
- FIG. 3 is a block diagram of the present invention as it is mounted onto a base
- FIG. 4 is a block diagram of the present invention as it is mounted in existing projection equipment.
- the preferred embodiment of the present invention is characterised by fitting existing projectors with a sound light source 10 containing a narrow spectrum red LED array in order to be able to read the analog information on a film utilizing color dyes rather than silver emulsion.
- the present invention is characterised by a sound light source 10 that produces narrow spectrum high intensity illumination with very little infrared energy.
- the sound light source 10 has a peak energy that coincides with the maximum density of a color dye layer to create an efficient, high quality system. Tests have shown that the a 660 nm GaAlAs ultrabright red coincides perfectly with the cyan dye density curves. (See curves in Figure l.) In the preferred embodiment, the light source 10 peak energy coincides with the cyan color dye layer for the best modulation effect.
- an immersion type lens 20 is used.
- the lens 20 redirects the wide LED output pattern into a small cone of light to allow it to efficiently enter the existing projector optics, as shown in Figure 3.
- the entire solid state sound lamp assembly 10 is mounted in a standard lamp base 22 (a) and 22(b) to permit it to be easily installed in existing projection equipment. Thereafter, the invention is housed in housing 26 which contains an opening for the immersion lens 20.
- the present invention combines leading edge LED technology with precision optics so that it is now possible to replace the incandescent light source to illuminate color dye film so the analog or alternative information encoded onto the color dye layer can be read.
- the LED die array will illuminate analog modulation on the color dye layers. Utilizing narrow spectrum LED's, the modulation effect will occur only by the cyan layer with minimal effect by the other dye layers. If the exposure on the other dye layers is off in any manner or if the other dye layers are not used, it will not effect the overall clarity of the analog sound.
- the same technique can be used with other dye layers provided the spectral peak coincides with the layer used such that multiple information on different dye layers can be simultaneously decoded.
- multiple color arrays can be incorporated in a single housing to allow playback of analog as well as alternative information. For example, digital information on the yellow or magenta dye layer may be simultaneously decoded by using additional arrays of different colors.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Optical Communication System (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/493,911 US5600206A (en) | 1995-06-23 | 1995-06-23 | Solid state sound lamp |
US493911 | 1995-06-23 | ||
PCT/US1996/003342 WO1997001129A1 (en) | 1995-06-23 | 1996-03-08 | Solid state sound lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0835478A1 true EP0835478A1 (en) | 1998-04-15 |
EP0835478A4 EP0835478A4 (en) | 1998-10-07 |
Family
ID=23962228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96909663A Ceased EP0835478A4 (en) | 1995-06-23 | 1996-03-08 | Solid state sound lamp |
Country Status (5)
Country | Link |
---|---|
US (1) | US5600206A (en) |
EP (1) | EP0835478A4 (en) |
AU (1) | AU707464B2 (en) |
CA (1) | CA2227447A1 (en) |
WO (1) | WO1997001129A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6191541B1 (en) * | 1998-10-05 | 2001-02-20 | Godfrey Engineering, Inc. | Solid state tail light for aircraft |
US7127448B1 (en) * | 2000-04-26 | 2006-10-24 | Oracle International Corporation | Reforming queries to selectively audit accesses to rows within a relational database |
WO2006017745A2 (en) * | 2004-08-05 | 2006-02-16 | Digital Ally, Inc. | Digital video recording flashlight |
US7373554B2 (en) * | 2004-09-24 | 2008-05-13 | Oracle International Corporation | Techniques for automatic software error diagnostics and correction |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4409284C1 (en) * | 1994-03-18 | 1995-04-06 | Philips Patentverwaltung | Sound-scanning device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4085296A (en) * | 1975-12-19 | 1978-04-18 | International Audio Visual, Inc. | Modulated sound reading system |
US4139382A (en) * | 1977-12-27 | 1979-02-13 | Polaroid Corporation | Photographic sound reproduction using silver diffusion transfer |
US4367930A (en) * | 1981-03-23 | 1983-01-11 | Eastman Kodak Company | Sound reproduction method and apparatus |
-
1995
- 1995-06-23 US US08/493,911 patent/US5600206A/en not_active Expired - Fee Related
-
1996
- 1996-03-08 AU AU53086/96A patent/AU707464B2/en not_active Ceased
- 1996-03-08 CA CA002227447A patent/CA2227447A1/en not_active Abandoned
- 1996-03-08 EP EP96909663A patent/EP0835478A4/en not_active Ceased
- 1996-03-08 WO PCT/US1996/003342 patent/WO1997001129A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4409284C1 (en) * | 1994-03-18 | 1995-04-06 | Philips Patentverwaltung | Sound-scanning device |
Non-Patent Citations (1)
Title |
---|
See also references of WO9701129A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2227447A1 (en) | 1997-01-09 |
AU707464B2 (en) | 1999-07-08 |
US5600206A (en) | 1997-02-04 |
AU5308696A (en) | 1997-01-22 |
WO1997001129A1 (en) | 1997-01-09 |
EP0835478A4 (en) | 1998-10-07 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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17P | Request for examination filed |
Effective date: 19980116 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE ES FR GB IT LI NL SE |
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A4 | Supplementary search report drawn up and despatched |
Effective date: 19980820 |
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AK | Designated contracting states |
Kind code of ref document: A4 Designated state(s): CH DE ES FR GB IT LI NL SE |
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17Q | First examination report despatched |
Effective date: 19990408 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19990408 |
|
18R | Application refused |
Effective date: 20000604 |